Heater for water-circulating systems of internal-combustion engines



HEATER FOR WATER CICULATING SYSTEMS OF INTERNAL COMBUSTION ENGINES Filed Feb. 18, 1925 Y v7 7'1 verni-or: Fig' '3- S Charles VMI/fwnA By WMM? vf/W Patented July 21, 1925.

UNITED STATES CHARLES H. WILSON, OIE MINNEAPOLIS, MINNESOTA, ASSIGNOR O'F ONE-HALF EDMUND BURKE, F MINNEAPQLIS, MINNESOTA. l

PATENT orricE.A

HEATER For. wArEnfoInoULA'rING sYsTEMsfor INTERNAL-connusrron ENGINES.

Application vfiled February 18, 1925. Serial No. 9,9631. l

citizen of the United States, residing at` Minneapolis, in the county of Hennepin and State of Minnesota, has invented certain new and useful Improvements in Heaters for Water-Circulating Systems of Internal- Combustion Engines, of which the following is a specification.

My invention relates to heaters for waterengines. An object is to provide an electric heater which is located in the water-circulating system of the engine so that when the 5 motor vehicle is standing in the garage in cold weather, current may be readily supplied to the heater for the purpose of preventing the water from freezing or becoming chilled to Such an extent that starting 0 is diicult. Another object of the invention is to provide a process of manufacturing the heater ineconomical and expeditious manner not requiring the casting of metal arts.

The full objects and advantages of my invention will appear in connection with the detailed description thereof, and the novel features embodied in my inventive idea will be particularly pointed out in the claims..

In the accompanying drawings which illustrate the application of ,my invention, Fig. 1 is'an elevational view showing the device applied to the water-circulating system of an internal combustion engine. Fig. 2 is a sectional view of the heating element before it has been coiled u Fig. ,3 is a sectional view Showing the eating element in coiled condition within a section'of rubber hose.

Referring to the construction shown in the drawings, an internal combustion engine is indicated in Fig. 1 having a cylinder jacket inlet connection 12 and a radiator outlet connection 14 leading from the bottom of the radiator`16. The connecting members l2 and 14 are joinedby a section of rubber hose 18 having reduced ends 20 and 22 which lit respectively over thek members 12 and 14 and are secured thereto by clamps 24 and 26. Within the hose section 18 is a heating element preferably placed therein by molding the hose around the heating element which is made up as follows:

A coiled resistance wire 28 has insulated end portions sho-wn at 30 and 32 which pass through cylinders 34 and 36 of 'niica or other insulating material. A Sheath 38 of asbestos or other insulating-material covers the coiled l wire 28 and the mica cylinders.` y tion of the device is placed inside of a metallic tube 40, preferably of copper which isprovided withcorrugations 42 and 44 at its respective ends. The tube 40 is then coiled up on a mandrel into the form shown in Fig. 3 and the rubber hose 18 is molded around the coil in such manner that the corrugations 42 and 44 are anchored in the wall of the ho-Se. The wall of the hose at these two places is preferably thickened by bosses 46 and 48. The insulated ends 30 and 32 of the resistance wire are extended and connected with a plug 50 whichr is adapted to be turned into an electric light socket.

The operation and advantages of my ini vention will be understood in connection ,40,l the latter presenting a large area. of

heating surface to the water which is thereby heated to Such an extentl as to cause it to circulate and prevent freezing or undue chilling in anyl part of the circulating system. It is apparent that the heated water will rise and circulation vwill be caused in4 the same direction inkwhich the water circulates when the engine is running. The heater may be conveniently and economically manufactured by my process without the necessity of casting any metallic parts.

1. A heater for water circulating systems of internal combustion enginescoinprising a section of hose adapted for attachment in a pipe of the circulating system, a coiled metallic tube in said hose having its ends extending through the V`wall thereof, insulatingY material within said tube, and a coiled resistance wire within said insulating material having itsends extending outl of the ends of said tube for connection with a Source of electrical energy.

2. A heater for water circulating Systems of internal combustion engines comprising 'Ihis pora section of hose adapted for attachment in a pipe of the circulating system, a coiled metallic tube in said hose, having its ends extending through the Wall thereof, cylinders of insulating material in the ends of said tube, a sheath of insulating'material Within said tube, and a coiled resistance Wire Within said sheath having its ends eX- tending out of said cylinders for connection With a source of electrical energy.

3. The process of manufacturing electric hea-ters which consists of placing a coiled resistance Wire in a metallic tube With said Wire surrounded by insulating material, forming said tube together With the enclosed Wire into a coil, and molding a rubber hose around said coil with the ends of Jlhe coil extending through the Wall of the ose.

4. The process of manufacturing electric heaters which consists in placing cylinders of insulating material in the ends lof a metallic tube, placing a coiled resistance Wire in said tube with the Wire surrounded by insulating material and having its ends eX- tending through said cylinders, forming said tube together with the enclosed Wire into a coil, and molding a rubber hose around said coil with the ends of the coil extending through the Wall of the hose.

In testimony whereof I have hereunto atlixed my signature.

CHARLES H. WLSON. 

